fix typos

Change-Id: I800fc4e1fcdd1f9e3bbe939beeb6d58379b5fd53

Author: rdementi

scripts/pcm.plot

@@ -2,15 +2,15 @@
 set key autotitle columnhead
 set datafile separator ","
 
-# change is needed
+# change as needed
 # set xlabel 'sample # (each is 1000ms)'
 
 set ylabel 'metric value'
 
 set terminal pdf
 set output "pcm.pdf"
 
-# change below  is needed
+# change below as needed
 # plot metrics 3 .. 37
 do for [m=3:37] {
     plot "single_header.pcm.csv" using m with dots